CN113821890A - Wind turbine generator blade fatigue life prediction device and method - Google Patents
Wind turbine generator blade fatigue life prediction device and method Download PDFInfo
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Abstract
A device and a method for predicting the fatigue life of a blade of a wind turbine generator set comprise a test box, wherein the side walls of two ends of the test box are both provided with an inlet and an outlet in a penetrating way, the end part of the test box is rotatably connected with a sealing door, the inner wall of the test box is fixed with a plurality of guide rods, the circumferential side walls of the guide rods are jointly connected with a supporting plate in a sliding way, the inner wall of the test box is rotationally connected with two symmetrically arranged adjusting rods through a bearing, the two adjusting rods are both in penetrating and rotating connection with the supporting plate, the side wall of the supporting plate is provided with a through groove in a penetrating way, the through groove corresponds to the two inlets and the outlets, the two inlets and the two outlets and the inner wall of the through groove are connected with a pressing plate in a sliding way, the measuring method can realize simultaneous measurement of multiple points through the device, the measuring frequency can be greatly reduced, the measuring efficiency of the prediction device can be effectively increased, and the fatigue life of the wind turbine blade can be conveniently predicted and used.
Description
Technical Field
The invention relates to the technical field of wind power, in particular to a device and a method for predicting the fatigue life of a blade of a wind turbine generator.
Background
The wind power generator is an electric power device which converts wind energy into mechanical work, and the mechanical work drives a rotor to rotate so as to finally output alternating current. The wind power generator generally comprises wind wheels, a generator, a direction regulator, a tower frame, a speed-limiting safety mechanism, an energy storage device and other components, is a heat energy utilization generator taking the sun as a heat source and taking the atmosphere as a working medium, and a wind power blade is the most pipe fitting component inside the wind power generator, so that the requirement on the wind power blade is high in the production process, and the fatigue life of the blade is usually predicted by using a measuring device before use so as to determine the replacement period in the later period.
Traditional measuring method mode is comparatively single, can't adopt single multiple spot simultaneous measurement, need carry out a lot of independent measurement, can influence its prediction efficiency, causes the sled of blade in the measurement process easily moreover to can form great error to measured data, and then make the measured data accuracy lower.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a device and a method for predicting the fatigue life of a wind turbine blade, which solve the problems of low efficiency and low measurement accuracy in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
a fatigue life prediction device for a wind turbine generator blade comprises a test box 1, wherein the side walls of two ends of the test box 1 are respectively provided with an inlet and an outlet 2 in a penetrating way, the end part of the test box 1 is rotatably connected with a sealing door 3, the inner wall of the test box 1 is fixedly provided with a plurality of guide rods 4, the circumferential side walls of the guide rods 4 are jointly and slidably connected with a support plate 6, the inner wall of the test box 1 is rotatably connected with two symmetrically arranged adjusting rods 5 through bearings, the two adjusting rods 5 are respectively rotatably connected with the support plate 6 in a penetrating way, the side wall of the support plate 6 is provided with a through groove 7 in a penetrating way, the through groove 7 corresponds to the two inlet and outlet 2, the side wall of the support plate 6 is rotatably connected with two horizontal plates 11 in a penetrating way, the two horizontal plates 11 are correspondingly arranged, one side, which is close to the two horizontal plates 11, is respectively provided with a plurality of measuring blocks 14, and each measuring block 14 is internally provided with a measuring device, the end walls of the two horizontal plates 11 are both provided with thread grooves 12, screw rods 13 are arranged in the thread grooves 12, the screw rods 13 are rotatably connected to the inner wall of the test box 1 through bearings, and the side wall of the test box 1 is provided with a connecting device;
the two inlets and outlets 2 and the inner walls of the through grooves 7 are connected with pressing plates 8 in a sliding mode, the inner tops of the two inlets and outlets 2 and the inner tops of the through grooves 7 are fixed with limiting push rods 9, the rod heads of the limiting push rods 9 are fixed with the upper ends of the corresponding pressing plates 8, and the bottoms of the pressing plates 8 are glued with contact layers 10.
Measuring device is including being fixed in the measuring push rod 21 of bottom in the measuring block 14, the pole head department of measuring push rod 21 is fixed with connecting plate 22, and connecting plate 22 offsets with measuring 14 inner walls are sealed, and the upper end of connecting plate 22 is fixed with response piece 23 and contact ball 24, contact ball 24 is the cavity type hemisphere, response piece 23 is located inside the contact ball 24.
The connecting device comprises a motor 15 fixed at one side end part of the test box 1, a main shaft of the motor 15 penetrates through the inner wall of the test box 1 and is fixed with the adjusting rod 5 at the lower end, the other side end part of the test box 1 is rotatably connected with two first rotating rods 16 and two second rotating rods 17 through bearings, the end parts of the two first rotating rods 16 and the two second rotating rods 17 penetrate into the test box 1, the two first rotating rods 16 are correspondingly fixed with the two adjusting rods 5, and the two second rotating rods 17 are correspondingly fixed with the two screw rods 13; the circumferential side walls of the two first rotating rods 16 are respectively fixed with a first gear 18, the circumferential side walls of the two second rotating rods 17 are respectively fixed with a second gear 19, the two first gears 18 are correspondingly meshed with the two second gears 19, and the circumferential side walls of the two first rotating rods 16 are jointly sleeved with a belt 20.
The number of teeth of the first gear 18 is half of the number of teeth of the second gear 19.
The prediction method based on the wind turbine generator blade fatigue life prediction device is characterized by comprising the following steps:
the method comprises the following steps: limiting clamp
Before predicting the fatigue life of the wind turbine blade, firstly, the wind turbine blade needs to be placed in a test box 1, so that the wind turbine blade is parked at the upper ends of an inlet and outlet 2 and a through groove 7, and then a limiting push rod 9 is used for pushing a pressing plate 8 to move, so that a contact layer 10 at the bottom of the pressing plate 8 is tightly attached to the surface of the wind turbine blade;
step two: single-point measurement using a measuring device
A measuring push rod 21 in the measuring block 14 is used for pushing the connecting plate 22 to move towards the direction of the blades of the wind turbine generator, so that a contact ball 24 at the upper end of the connecting plate 22 is abutted against the blades of the wind turbine generator, and an induction block 23 in the contact ball 24 is used for carrying out induction measurement on the stress of each point of the blades of the wind turbine generator;
step three: adjusting the measuring position
When other parts are measured, firstly, the limiting push rod 9 in the through groove 7 needs to be reset, then the motor 15 is started, the adjusting rod 5 is driven to rotate through the rotation of the motor 15, so that the supporting plate 6 can be moved, and the horizontal plate 11 can be moved under the driving of the first rotating rod 16, the second rotating rod 17, the first gear 18 and the second gear 19, so that the position of the measuring block 14 can be changed, and further, the stress of different positions of the blades of the wind turbine generator can be measured;
step four: plotting S-N curves using multi-point measurement data
Through multi-point measurement, filtering processing is carried out on the electric signals transmitted by the induction block 23 by using external equipment, the electric signals are converted into actual numerical values, and then the measured numerical values are used for drawing an S-N curve which takes the fatigue strength as a vertical coordinate and takes the logarithmic value of the fatigue life as a horizontal coordinate and shows the relation between the fatigue strength and the fatigue life of the wind turbine blade;
step five: blade fatigue life prediction using S-N curve
And finally, predicting the fatigue life of the wind turbine generator blade by utilizing the S-N curve, so that the fatigue life of the wind turbine generator blade with higher accuracy can be obtained.
The belt 20 drives the horizontal plates 11 at the upper and lower ends to simultaneously move in the same direction, so that the upper and lower ends of the measurement part can be measured simultaneously.
The contact layer 10 and the contact ball 24 are both made of rubber materials.
Compared with the prior art, the invention has the advantages that:
1. according to the invention, two symmetrical measuring devices are arranged at the upper end of the same horizontal plate, so that simultaneous measurement of multiple points can be realized, the measuring times can be greatly reduced, the measuring efficiency of the predicting device can be effectively increased, and the fatigue life of the wind turbine blade can be conveniently predicted and used.
2. According to the invention, the number of teeth of the first gear is half of that of the second gear, and meanwhile, the moving distance of the horizontal plate is half of that of the supporting plate, so that the measuring block is always positioned between the supporting plate and the end part of the testing box, two ends of the blade measuring part of the wind turbine generator can be clamped tightly, and the measured data can be more accurate.
3. In the invention, in the moving process of the horizontal plates, the horizontal plates at the upper end and the lower end can simultaneously move in the same direction under the driving of the belt, so that the upper end and the lower end of a measuring part can be simultaneously measured, the stability of the blades of the wind turbine generator can be ensured, and the accuracy of measured data can be higher.
4. According to the invention, the contact layer and the contact ball are made of rubber materials, so that the integrity of the wind turbine blade can be ensured in the process of clamping and measuring the wind turbine blade, the damage to the surface of the wind turbine blade can be avoided, the error of the prediction result of the wind turbine blade is smaller, and the accuracy is higher.
Drawings
Fig. 1 is a schematic structural diagram of a wind turbine blade fatigue life prediction device provided by the invention.
Fig. 2 is a top sectional view of a fatigue life predicting apparatus for a wind turbine blade according to the present invention.
Fig. 3 is an enlarged view of a portion a in fig. 1.
Fig. 4 is a schematic diagram of a measuring device in the fatigue life predicting device for the wind turbine blade according to the present invention.
Fig. 5 is a side view of a fatigue life prediction device for a wind turbine blade according to the present invention.
In the figure: the device comprises a test box 1, an inlet and an outlet 2, a sealing door 3, a guide rod 4, an adjusting rod 5, a supporting plate 6, a through groove 7, a pressing plate 8, a limit push rod 9, a contact layer 10, a horizontal plate 11, a thread groove 12, a screw rod 13, a measuring block 14, a motor 15, a first rotating rod 16, a second rotating rod 17, a first gear 18, a second gear 19, a belt 20, a measuring push rod 21, a connecting plate 22, an induction block 23 and a contact ball 24.
Detailed Description
The following examples are for illustrative purposes only and are not intended to limit the scope of the present invention.
Referring to fig. 1-3, a fatigue life prediction device for a wind turbine generator blade comprises a test box 1, wherein the side walls of two ends of the test box 1 are respectively provided with an inlet and an outlet 2 in a penetrating way, the end part of the test box 1 is rotatably connected with a sealing door 3, the inner wall of the test box 1 is fixed with a plurality of guide rods 4, the circumferential side walls of the guide rods 4 are jointly and slidably connected with a support plate 6, the inner wall of the test box 1 is rotatably connected with two symmetrically arranged adjusting rods 5 through bearings, the two adjusting rods 5 are respectively rotatably connected with the support plate 6 in a penetrating way, the side wall of the support plate 6 is provided with a through groove 7 in a penetrating way, the through groove 7 corresponds to the two inlet and outlet 2, the inner walls of the two inlet and outlet 2 and the through groove 7 are respectively and slidably connected with a pressing plate 8, the inner tops of the two inlet and outlet 2 and the through groove 7 are respectively fixed with a limit push rod 9, the rod head of each limit push rod 9 is fixed with the upper end of the corresponding pressing plate 8, the bottom of each pressing plate 8 is glued with a contact layer 10, the lateral wall of backup pad 6 runs through sliding connection and has two horizontal plates 11, two horizontal plates 11 correspond the setting, one side that two horizontal plates 11 are close to mutually all is fixed with a plurality of measuring blocks 14, the inside of every measuring block 14 all is provided with measuring device, thread groove 12 has all been seted up to the end wall of two horizontal plates 11, the inner wall of test box 1 rotates through the bearing and is connected with two lead screws 13, lead screw 13 is located inside thread groove 12, the lateral wall of test box 1 is provided with connecting device.
The connecting device comprises a motor 15 fixed at one side end part of the test box 1, a main shaft of the motor 15 penetrates through the inner wall of the test box 1 and is fixed with the adjusting rod 5 at the lower end, the other side end part of the test box 1 is rotatably connected with two first rotating rods 16 and two second rotating rods 17 through bearings, the end parts of the two first rotating rods 16 and the two second rotating rods 17 penetrate into the test box 1, the two first rotating rods 16 are correspondingly fixed with the two adjusting rods 5, and the two second rotating rods 17 are correspondingly fixed with the two screw rods 13; the circumferential side walls of the two first rotating rods 16 are all fixed with first gears 18, the circumferential side walls of the two second rotating rods 17 are all fixed with second gears 19, the two first gears 18 are correspondingly meshed with the two second gears 19, the circumferential side walls of the two first rotating rods 16 are jointly sleeved with a belt 20, and the adjusting rod 6 and the screw rod 13 are threaded rods.
Referring to fig. 4, the measuring device includes a measuring push rod 21 fixed at the bottom inside the measuring block 14, a connecting plate 22 is fixed at the rod head of the measuring push rod 21, the connecting plate 22 abuts against the inner wall of the measuring block 14 in a sealing manner, an induction block 23 and a contact ball 24 are fixed at the upper end of the connecting plate 22, the contact ball 24 is a hollow hemisphere, the induction block 23 is located inside the contact ball 24, and the measuring push rod 21 and the limit push rod 9 are both electric push rods.
The number of teeth of the first gear 18 is half of the number of teeth of the second gear 19.
A method for predicting the fatigue life of a wind turbine blade comprises the following steps:
the method comprises the following steps: limiting clamp
Before predicting the fatigue life of the wind turbine blade, the wind turbine blade is placed in the test box 1, the wind turbine blade is parked at the upper ends of the inlet and outlet 2 and the through groove 7, then the pressure plate 8 is pushed to move by the limiting push rod 9, the contact layer 10 at the bottom of the pressure plate 8 is tightly attached to the surface of the wind turbine blade, the stability of the wind turbine blade in the measuring process is ensured, and the measured data are more accurate;
step two: single-point measurement using a measuring device
A measuring push rod 21 in the measuring block 14 is used for pushing the connecting plate 22 to move towards the direction of the blades of the wind turbine generator, so that a contact ball 24 at the upper end of the connecting plate 22 is abutted against the blades of the wind turbine generator, and an induction block 23 in the contact ball 24 is used for carrying out induction measurement on the stress of each point of the blades of the wind turbine generator;
step three: adjusting the measuring position
When other parts are measured, firstly, the limiting push rod 9 in the through groove 7 needs to be reset, then the motor 15 is started, the adjusting rod 5 is driven to rotate through the rotation of the motor 15, so that the supporting plate 6 can be moved, and the horizontal plate 11 can be moved under the driving of the first rotating rod 16, the second rotating rod 17, the first gear 18 and the second gear 19, so that the position of the measuring block 14 can be changed, further, the stress of different positions of the blades of the wind turbine generator can be measured, the measurement of multiple different positions can be realized, and the accidental nature of data collection can be avoided;
step four: plotting S-N curves using multi-point measurement data
The electric signals transmitted by the induction block 23 are filtered through external equipment, the electric signals are converted into actual numerical values, then measured numerical values are utilized to draw an S-N curve which takes the fatigue strength as a vertical coordinate and takes a logarithmic value of the fatigue life as a horizontal coordinate and shows the relation between the fatigue strength and the fatigue life of the blades of the wind turbine generator, and the accuracy of the S-N curve can be higher through multi-point measurement;
step five: blade fatigue life prediction using S-N curve
And finally, predicting the fatigue life of the wind turbine blade by utilizing the S-N curve, so that the fatigue life of the wind turbine blade with higher accuracy can be obtained, and the wind turbine blade can be conveniently used.
The first rotating rod 16 and the second rotating rod 17 are meshed and connected through the first gear 18 and the second gear 19, the number of teeth of the first gear 18 is half of that of the second gear 19, the horizontal plate 11 can move in the process that the adjusting rod 5 drives the supporting plate 6 to move, meanwhile, the moving distance of the horizontal plate 11 is half of that of the supporting plate 6, the measuring block 14 can be located between the supporting plate 6 and the end part of the testing box 1 all the time, both ends of the blade measuring part of the wind turbine generator can be clamped, and the measured data are more accurate; the belt 20 drives the horizontal plates 11 at the upper end and the lower end to simultaneously move in the same direction, so that the upper end and the lower end of a measurement part can be simultaneously measured, the stability of the blades of the wind turbine generator can be ensured, and the accuracy of measurement data can be higher; the contact layer 10 and the contact ball 24 are made of rubber materials, so that the completeness of the wind turbine blade can be guaranteed in the process of clamping and measuring the wind turbine blade, the damage to the surface of the wind turbine blade can be avoided, the error of the prediction result of the wind turbine blade is small, and the accuracy is high.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (8)
1. The fatigue life prediction device for the blades of the wind turbine generator comprises a test box (1) and is characterized in that side walls at two ends of the test box (1) are respectively penetrated and provided with an inlet and an outlet (2), the end part of the test box (1) is rotatably connected with a sealing door (3), the inner wall of the test box (1) is fixed with a plurality of guide rods (4), the circumferential side walls of the guide rods (4) are jointly and slidably connected with a support plate (6), the inner wall of the test box (1) is rotatably connected with two symmetrically arranged adjusting rods (5) through bearings, the two adjusting rods (5) are respectively penetrated and rotatably connected with the support plate (6), the side wall of the support plate (6) is penetrated and provided with a through groove (7), the through groove (7) corresponds to the two inlet and outlet (2), and the side wall of the support plate (6) is penetrated and slidably connected with two horizontal plates (11), the two horizontal plates (11) are correspondingly arranged, a plurality of measuring blocks (14) are fixed on one sides of the two horizontal plates (11) close to each other, a measuring device is arranged inside each measuring block (14), thread grooves (12) are formed in the end walls of the two horizontal plates (11), lead screws (13) are arranged inside the thread grooves (12), the lead screws (13) are rotatably connected to the inner wall of the test box (1) through bearings, and connecting devices are arranged on the side walls of the test box (1);
two import and export (2) and lead to equal sliding connection of groove (7) inner wall and have clamp plate (8), two import and export (2) and the interior top that leads to groove (7) all are fixed with spacing push rod (9), every the pole head of spacing push rod (9) all is fixed with the upper end of corresponding clamp plate (8), every the bottom of clamp plate (8) all is glued contact layer (10).
2. The fatigue life prediction device for the blades of the wind turbine generator set according to claim 1, wherein the measurement device comprises a measurement push rod (21) fixed at the bottom in the measurement block (14), a connecting plate (22) is fixed at the rod head of the measurement push rod (21), the connecting plate (22) is in sealing contact with the inner wall of the measurement block (14), an induction block (23) and a contact ball (24) are fixed at the upper end of the connecting plate (22), the contact ball (24) is a hollow hemisphere, and the induction block (23) is located inside the contact ball (24).
3. The method for predicting the fatigue life of the wind turbine blade according to claim 2, wherein the contact layer (10) and the contact ball (24) are both made of rubber materials.
4. The fatigue life prediction device for the blades of the wind turbine generator set according to claim 1, wherein the connecting device comprises a motor (15) fixed at one side end of the test box (1), a main shaft of the motor (15) penetrates through the inner wall of the test box (1) and is fixed with a lower adjusting rod (5), the other side end of the test box (1) is rotatably connected with two first rotating rods (16) and two second rotating rods (17) through bearings, the ends of the two first rotating rods (16) and the two second rotating rods (17) penetrate into the test box (1), the two first rotating rods (16) are correspondingly fixed with the two adjusting rods (5), and the two second rotating rods (17) are correspondingly fixed with the two screw rods (13); the circumference lateral wall of two first bull sticks (16) all is fixed with first gear (18), and the circumference lateral wall of two second bull sticks (17) all is fixed with second gear (19), and two first gear (18) correspond the meshing with two second gear (19), two the circumference lateral wall of first bull stick (16) overlaps jointly and is equipped with belt (20).
5. The fatigue life prediction device of wind turbine blade according to claim 4, wherein the number of teeth of the first gear (18) is half of the number of teeth of the second gear (19).
6. The method for predicting the fatigue life of the wind turbine blade based on any one of claims 1 to 5 is characterized by comprising the following steps of:
the method comprises the following steps: limiting clamp
Before predicting the fatigue life of the wind turbine blade, the wind turbine blade is placed in a test box (1) to be parked at the upper ends of an inlet and an outlet (2) and a through groove (7), and then a limiting push rod (9) is used for pushing a pressing plate (8) to move to enable a contact layer (10) at the bottom of the pressing plate (8) to be tightly attached to the surface of the wind turbine blade;
step two: single-point measurement using a measuring device
A measuring push rod (21) in a measuring block (14) is used for pushing a connecting plate (22) to move towards the direction of a wind turbine blade, so that a contact ball (24) at the upper end of the connecting plate (22) is abutted against the wind turbine blade, and an induction block (23) in the contact ball (24) is used for carrying out induction measurement on the stress of each point of the wind turbine blade;
step three: adjusting the measuring position
When other parts are measured, firstly, the limiting push rod (9) in the through groove (7) needs to be reset, then the motor (15) is started, the adjusting rod (5) is driven to rotate through the rotation of the motor (15), so that the supporting plate (6) can be moved, the horizontal plate (11) can be moved under the driving of the first rotating rod (16), the second rotating rod (17), the first gear (18) and the second gear (19), so that the position of the measuring block (14) can be changed, and further the stress of different positions of the blades of the wind turbine generator can be measured;
step four: plotting S-N curves using multi-point measurement data
Through multi-point measurement, filtering processing is carried out on an electric signal transmitted by the induction block (23) by using external equipment, the electric signal is converted into an actual numerical value, and then an S-N curve showing the relation between the fatigue strength and the fatigue life of the wind turbine blade by using the fatigue strength as a vertical coordinate and the logarithmic value of the fatigue life as a horizontal coordinate is drawn by using the measured numerical value;
step five: blade fatigue life prediction using S-N curve
And finally, predicting the fatigue life of the wind turbine generator blade by utilizing the S-N curve, so that the fatigue life of the wind turbine generator blade with higher accuracy can be obtained.
7. The method for predicting the fatigue life of the blades of the wind turbine generator set according to claim 6, wherein the first rotating rod (16) and the second rotating rod (17) are meshed and connected through a first gear (18) and a second gear (19), and because the number of teeth of the first gear (18) is half of that of the second gear (19), the horizontal plate (11) can move in the process that the adjusting rod (5) drives the supporting plate (6) to move, and meanwhile, the moving distance of the horizontal plate (11) is half of that of the supporting plate (6), so that the measuring block (14) is always located between the supporting plate (6) and the end of the testing box (1), and both ends of the measuring part of the blades of the wind turbine generator set can be clamped.
8. The method for predicting the fatigue life of the blade of the wind turbine generator set according to claim 6, wherein the belt (20) drives the horizontal plates (11) at the upper end and the lower end to simultaneously move in the same direction, so that the upper end and the lower end of the measurement part are simultaneously measured.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115493830A (en) * | 2022-10-20 | 2022-12-20 | 华能新能源股份有限公司 | Method and device for predicting fatigue life of blades of wind turbine generator |
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